electronics

Can You Hear a 1-dB Change?

by

Decibels are commonly used in electronic communications to describe and compare signal levels. I’ve often heard that one dB is considered to be the smallest change that a typical person can detect by ear. I recently came across this website audiocheck.net that is set up to generate different audio tones and to do a blind … Read more

Radio Shack Brands

by

Recently, Retail Ecommerce Ventures (REV) announced its purchase of certain iconic RadioShack brands and related assets. Many radio amateurs and electronics hobbyists would like to see something happen in the way of a new, improved RadioShack, whether online or via brick-and-mortar stores. RadioShack is still a strong brand but it takes more than a brand … Read more

HT and Light Bulb Load

by

The light-bulb dummy load has been used with HF transceivers from way back in the old days (and sometimes more recently). These “dummy loads” tended to radiate a bit and can actually be used as a (poor) antenna. A few years ago, the Lightbulb QSO Party promoted the use of light bulbs as antennas during … Read more

Radio Frequency Interference From 12V-to-USB Adapters

by

Many small electronic devices have switching regulators in them that can generate a bunch of Radio Frequency Interference (RFI). This is not my first encounter with RFI-spewing devices. See this article about a automotive 12V-to-USB adapter giving me trouble: This Interference Seems To Follow Me Everywhere I recently bought a couple of adapters that are … Read more

ISO-TIP 7700 Soldering Iron Review

by

I recently had the opportunity to try out a new ISO-TIP 7700 soldering iron. This is a rechargeable soldering iron without a lot of extra features but it is plenty capable for small soldering tasks. Here’s a few specs from the ISO-TIP web site: MODEL #7700 – Fully recharges in 3.5 to 4.0 hours – … Read more

Meet the Arc Fault Circuit Interrupter

by

You are probably familiar with the Ground Fault Circuit Interrupter (GFCI), also called Ground Fault Interrupter (GFI), Residual-Current Device (RCD) and a few other names. While doing some electrical work for a family member, I discovered Arc Fault Circuit Interrupters (AFCIs) in the breaker box. Having a genuine Electrical Engineering degree (two, actually), I’d like to believe … Read more